Bis-o-aminophenols and processes for producing bis-o-aminophenols

US6861560B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Andreas Walter · Egloffstein, DE
• Ingo Gnüchtel · Wengen, DE
• Anna Maltenberger · Leutenbach, DE
• Recai Sezi · Simmerath, DE
• Horst Hartmann · Dresden, DE

Key dates

• Filing date: Jun 27, 2003
• Grant date: Mar 1, 2005
• Expiry date: Aug 3, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/24
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A bis-o-aminophenol has a formula I These bis-o-aminophenols permit the preparation of polybenzoxazoles stabilized at high temperatures. The bis-o-aminophenols are preferably prepared from the corresponding diols, which are first nitrosated. The nitroso compound is then reduced to the amino compound by hydrogenation with Pd/C and H2.